Another concern is that there might be several weaknesses in a candidate, where one weakness masks another. If you say something like "You have weakness X", an

Another concern is that there might be several weaknesses in a candidate, where one weakness masks another. If you say something like "You have weakness X", and they go take a class and work on X, then they might expect that they are now hirable. You can imagine the friction that might happen when a candidate keeps going back only to hear about yet a new reason to be rejected. Or, on the other side of the coin, you can imagine people who are good at checking boxes and working a system, but not a good fit for the position. They will knock down the reasons for rejection one after the next and eventually get hired, but they may still be a bad fit for the role. You can't test for everything perfectly during your interview process.